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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash Flows From Operating Activities:      
Net loss $ (27,453,954) $ (46,958,921) $ (40,708,552)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation of property, plant and equipment, and investment in leased property 2,132,117 4,969,263 3,634,668
Amortization of intangible assets 2,322,876 2,263,627 2,132,333
Stock-based compensation 1,452,259 1,174,576 1,928,501
Loss on disposal of property, plant and equipment 308,621 86,794 504,397
(Gain) loss on sale of leased assets (673,358) 290,491  
Provision for bad debts   10,160 92,560
Realized loss on available for sale securities 22,421    
Net unrealized gains on trading securities   (5,977,822) (4,246,524)
Change in fair value of auction rate debt securities repurchase agreement   5,977,822 4,246,524
Gain on repayable government assistance     (324,300)
Change in fair value of common stock warrant liability (3,447,153)    
Changes in operating assets and liabilities:      
Accounts receivable (9,192,901) (2,193,325) 65,440
Inventory 1,438,195 (4,409,582) (95,935)
Prepaid expenses and other current assets (310,089) 1,624,422 (684,277)
Accounts payable, accrued expenses, product warranty reserve and other liabilities (1,101,356) 2,618,994 (3,944,407)
Deferred revenue 1,192,255 (246,968) (828,675)
Net cash used in operating activities (33,310,067) (40,770,469) (38,228,247)
Cash Flows From Investing Activities:      
Purchase of property, plant and equipment (1,326,144) (1,100,478) (532,960)
Investment in leased property, net   (2,233,334) (2,461,526)
Restricted cash 525,000 1,740,405 (2,265,405)
Proceeds from disposal of property, plant and equipment 46,650 121,564 223,000
Proceeds from sale of leased assets 673,358 3,221,168  
Proceeds from trading securities   59,375,001 3,500,000
Proceeds from maturities and sales of available-for-sale securities 10,399,396 79,754,039 137,555,930
Purchases of available-for-sale securities   (42,311,734) (161,803,208)
Net cash provided by (used in) investing activities 10,318,260 98,566,631 (25,784,169)
Cash Flows From Financing Activities:      
Purchase of treasury stock (158,492) (441,506) (534,418)
Proceeds from issuance of common stock and warrants 22,583,877    
Proceeds from stock option exercises and employee stock purchase plan     76,493
Stock issuance costs (1,891,378)    
Proceeds (repayment) of borrowings under line of credit 5,405,110 (59,375,000) (3,500,000)
Proceeds from long-term debt     1,793,461
Principal payments on long-term debt (9,956) (1,561,371) (229,602)
Net cash provided by (used in) financing activities 25,929,161 (61,377,877) (2,394,066)
Effect of exchange rate changes on cash (35,864) (43,865) 142,965
Increase (decrease) in cash and cash equivalents 2,901,490 (3,625,580) (66,263,517)
Cash and cash equivalents, beginning of period 10,955,403 14,580,983 80,844,500
Cash and cash equivalents, end of period $ 13,856,893 $ 10,955,403 $ 14,580,983